Digital Read Serial - Intel Galileo example in python

digital_read_serial.py

# This is a simple example of interacting with digital input of Intel Galileo board
# See http://arduino.cc/en/Tutorial/DigitalReadSerial
# and http://www.itsudo.com/galileo/2014/03/01/reading-digital-input-from-galileo-via-sysfs.html

import os
import time

button_gpio = 17 # maps to digital PIN5 on the board

# Export gpio port so we can interact with it
if(not (os.path.exists("/sys/class/gpio/gpio%d" % button_gpio + "/"))):
  with open('/sys/class/gpio/export', 'w') as file:
    file.write('%d' % button_gpio)

# Let's make sure that gpio is set to in, so it reads input
with open('/sys/class/gpio/gpio%d/direction' % button_gpio, 'w') as file: file.write('in')

# Read value from the input and output it to the console
while True:
  with open('/sys/class/gpio/gpio%d/value' % button_gpio, 'r') as file:
    print file.read()
  time.sleep(.5)